Etymology: (1400–50; < OF declinaison < L dēclīnātiōdeclination)
Definition of 'declension'
Princeton's WordNet
1. (noun)declension the inflection of nouns and pronouns and adjectives in Indo-European languages
2. (noun)deterioration, decline in quality, declension, worsening process of changing to an inferiorstate
3. (noun)descent, declivity, fall, decline, declination, declension, downslope a downward slope or bend
4. (noun)declension a class of nouns or pronouns or adjectives in Indo-European languages having the same (or very similar) inflectional forms "the first declension in Latin"
Definition of 'declension'
Webster Dictionary
1. (noun)declension the act or the state of declining; declination; descent; slope
2. (noun)declension a falling off towards a worse state; a downward tendency; deterioration; decay; as, the declension of virtue, of science, of a state, etc
3. (noun)declension act of courteously refusing; act of declining; a declinature; refusal; as, the declension of a nomination
4. (noun)declension inflection of nouns, adjectives, etc., according to the grammatical cases
Definitions of declension 
